Passage kinetics of internal and external markers in lactating dairy cows

S. Ahvenjärvi, A. Vanhatalo, A. N. Hristov, P. Huhtanen

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Particle passage kinetics in dairy cows was assessed using acid detergent fibre (ADF) associated 15N as an internal marker and chromium (Cr) mordanted grass silage, ytterbium (Yb) labelled grass silage and dysprosium (Dy) labelled faecal particles as external markers. Kinetic parameters were estimated using two-compartment models assuming gamma time-dependent (G3) passage rate in the first compartment and age-independent (G3) in the second compartment. Parameter estimates were consistent between ADF-15N and Cr, but for Yb and Dy the total mean retention time and retention time in the age-independent compartment was shorter.

Original languageEnglish (US)
Pages (from-to)19-22
Number of pages4
JournalJournal of Animal and Feed Sciences
Issue numberSUPPL. 1
StatePublished - 2004

All Science Journal Classification (ASJC) codes

  • Food Science
  • Animal Science and Zoology


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